import  re

print(re.match('<meta data-vue-meta="true" itemprop="datePublished" content="(\d{4}-\d{2}-\d{2} \d{2}:\d\d:\d\d)">',
               '<meta data-vue-meta="true" itemprop="datePublished" content="2022-05-08 18:03:51">').group(1))